This seemed of possible interest to the group
SimSig is a signalling simulation of Railtrack's Integrated Electronic Control Centres (IECCs). It puts you in the signaller's chair and lets you set the routes, deal with problems, etc. It accurately simulates interlockings, specifically Solid State Interlockings (SSIs), which is the main new interlocking technology in Britain today. Even overlaps (never before seen on products already on the market), swinging overlaps, approach locking, approach control, time-of-operation point locking, shunt routes, warner routes, call-on routes, they are all in SimSig!
The Train Describer (TD) is the only real way signalmen identify trains on the screen (rather like flight numbers). So interposes, cancels, normal steps, ripple steps, shuttle steps, are all in SimSig!
Of course, one of the real benefits of IECCs (and some NX panels too) is the Automatic Routesetting System (ARS). This relieves the signaller of a lot of his work. In SimSig a simple version of ARS is provided because YOU are the one meant to be setting routes! The idea of ARS in SimSig is to let ARS do the areas you are not interested in, leaving the interesting parts to yourself. As a signalman at Ashford IECC once told me, 'we like to control the major station areas but let ARS do the simple junctions'.
Between the ARS and the TD, they perform Automatic Code Insertion (ACI) when a train reaches its destination. This is based on timetable information (transmitted from the TimeTable Processor (TTP) in a real IECC). And, of course, you can edit your own timetables right from within SimSig! The timetable editor is built in and does not cost any extra.
Train motion is accurately simulated, using braking and acceleration profiles, maximum speeds, differential line speeds, station stops, etc. Trains can also be timetabled to join or divide, run-round, etc.